Non-Controlling Interests - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Entity	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Entity	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Minority Interest [Line Items]
Number of majority-owned partnerships that have third-party, non-controlling ownership interests that have been consolidated | Entity	6		6
Non-controlling interests—other consolidated partnerships	$ 32		$ 32		$ 32
Number of majority-owned partnerships that have third-party, non-controlling ownership interests with finite lives | Entity	2		2
Non-controlling interests in outside partnerships, fair value	$ 94		$ 94		$ 85
Net income attributable to non-controlling interests outside partnerships	1	$ 2	6	$ 5
Net income	$ 3	$ 2	$ 4	$ 5
HOST HOTELS & RESORTS L.P.
Minority Interest [Line Items]
OP units conversion basis			One common OP unit may be exchanged into 1.021494 shares of Host Inc
Shares issuable upon conversion of one OP unit	1.021494		1.021494		1.021494
Lower Limit
Minority Interest [Line Items]
Majority-owned partnerships with mandatorily redeemable non-controlling interests, termination year			2081
Upper Limit
Minority Interest [Line Items]
Majority-owned partnerships with mandatorily redeemable non-controlling interests, termination year			2095